Ambu® manikins have a patented hygienic system which protect the student and makes internal cleaning entirely unnecessary. Look - Listen - Feel. Just as in real life, ventilation can be seen and exhalation through the nose and mouth can be felt and heard. Lightweight and sturdy, hence very easy to transport. Airways open only when head is correctly hyper extended. Stomach inflation is indicated by a whistling sound. A very high quality at an affordable price.